HOME > Magnetic Characteristic > Typical Magnets

Site Map

to Japanese Page

Inquiey

MAGNETIC CHARACTERISTIC

B-H CURVE OF TYPICAL MAGNETS
δB-H CURVE OF TYPICAL MAGNETS

Representative Magnets

Each magnet has a characteristic shape due to its materialistic physical features.

Rare earth magnets;
This newcomer to the magnet industry with its high performance of both residual flux density and coercive force superior to all other magnets, allows for its very compact and thin design.

Alnico Magnets;
The most established and widely used magnets. Because of the low coercive force and high flux density, the material needs distance between N and S pole, therefore the shape employs a long and thin design. Usable at a high temperature due to a low temperature coefficient.

Ferrite magnets;
The feature of a relatively low residual flux density, coupled with a high coercive force makes material shape flat. Because of high availability of material, the economical cost is attractive to the magnet designers.

MA magnets;
Since the physical property is located between Alnico and Ferrite magnets, MA magnets features both characteristics and employs a thick and short shape.
Standard Rating Characteristics of Representative Magnets
Type of magnets Rare Earth Ferrite Alnico Magnet
Item Unit  Nd-Fe-b Sm-Co Isotropic
Ba-Ferrite
Anisotropic
Sr-Ferrite
by Dry
Anisotropic
sr-Ferrite
by wet
Alnico-5 Alnico-8 Haimag
Alnico-5 col
Brr [ kG ] 12.4 10.5 2.2 3.6 4 12.7 8.8 13.5
( mT ) 1,240 1,050 220 360 400 1,270 880 1,350
bHc [ kOe ] 11.6 8 1.9 3 3.3 0.65 1.47 0.75
( kA/m ) 923 636 151 238 262 51 117 59
Bhmax [ MGOe ] 37 24 1 3 3.8 5.3 5.2 7.3
( kJ/ÜG) 294.5 191 8 23.9 30.2 42.2 41.4 58.1
Temperature
characteristic
of Br
%/Åé -0.12 -0.04 -0.18 -0.18 -0.18 -0.02 -0.01 -0.02
Curie point °C 320 750 460 460 460 850 850 850
Density g/cÜG 7.4 8.3 4.8 4.8 4.9 7.3 7.3 7.3